Macbook Now?

I am looking to buy the macbook. However, i have heard that the new merom chip is coming out and i am having second thoughts. I need to know whether it would be worth the wait.. (would the performance of the core 2 duo be double the performance of the core duo? i have heard that it would be around 20%.)

So, do you think that it would be better to buy a macbook now or wait until the merom chips come out and get either a faster merom or a cheaper core duo which would be reducd in price from what they are now.

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